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定时器T0被四次调用，控制led灯
- #include<reg52.h> //头文件
- #define MY_TIMER_MAX (4) //最多四个定时器
- #define NULL (0)
- typedef void (*pFun)(void); //callback 函数指针类型
- typedef struct myTimer
- {
- char on; //开关
- char is_period; //是否周期循环
- unsigned short int time_out; //定时时间，单位ms
- unsigned short int count; //定时计数用
- }
- MY_TIMER;
- pFun callback[MY_TIMER_MAX] = {NULL}; //定时器回调函数数组
- MY_TIMER myTimerList[MY_TIMER_MAX] = {0}; //定时器结构数组
- int gMyTimerMessage[MY_TIMER_MAX] = {0}; //定时器消息数组
- sbit LED1=P1^0;
- sbit LED2=P1^1;
- sbit LED3=P1^2;
- sbit LED4=P1^3;
- #define ALL_ON {LED1=0;LED2=0;LED3=0;LED4=0;} //灯全开
- //创建定时器，简化版本。
- int CreatTimer(int index,unsigned short int time_out,char is_period,pFun callbackFun)
- {
- if(index >= MY_TIMER_MAX) return -1;
- myTimerList[index].on = 1;
- myTimerList[index].is_period = is_period;
- myTimerList[index].time_out = time_out;
- myTimerList[index].count = 0;
- callback[index] = callbackFun;
- return index;
- }
- //四个LED控制函数，on初始是0，第一次调用on变为1，是关灯。
- void led_1_ctrl(void)
- {
- static char on = 0;
- on = !on;
- LED1 = on;
- }
- void led_2_ctrl(void)
- {
- static char on = 0;
- on = !on;
- LED2 = on;
- }
- void led_3_ctrl(void)
- {
- static char on = 0;
- on = !on;
- LED3 = on;
- }
- void led_4_ctrl(void)
- {
- static char on = 0;
- on = !on;
- LED4 = on;
- }
- void Init_Timer0(void) //初始化定时器0
- {
- TMOD=0x01; //定时器0，使用模式1，16位定时器
- TH0=(65536-1000)/256; //给定初值
- TL0=(65536-1000)%256;
- EA=1; //打开总中断
- ET0=1; //打开定时器中断
- TR0=1; //开定时器
- }
- void main() //主函数
- {
- unsigned int i;
- ALL_ON;
- CreatTimer(0,250,1,led_1_ctrl);
- CreatTimer(1,500,1,led_2_ctrl);
- CreatTimer(2,1000,1,led_3_ctrl);
- CreatTimer(3,2000,1,led_4_ctrl);
- Init_Timer0();//初始化定时器0
- while(1)
- {
- for(i = 0; i<MY_TIMER_MAX; ++i)
- {
- if(gMyTimerMessage[i]) //定时器消息来到，启动。
- {
- gMyTimerMessage[i] = 0; //消息清除
- if(callback[i] != NULL)
- {
- (*callback[i])(); //调用回调函数
- }
- }
- }
- }
- }
- //定时器中断函数，1ms 定时。
- void Timer0_isr(void) interrupt 1
- {
- unsigned int i = 0;
- TH0=(65536-1000)/256;//重新赋值 1ms
- TL0=(65536-1000)%256;
- EA = 0;
- for(i = 0; i<MY_TIMER_MAX; ++i)
- {
- if(myTimerList[i].on)
- {
- ++(myTimerList[i].count); //计数
- if(myTimerList[i].count >= myTimerList[i].time_out) //定时到
- {
- gMyTimerMessage[i] = 1; //发消息
- if(myTimerList[i].is_period) //是否周期循环
- {
- myTimerList[i].count = 0; //计数重置
- }
-
- …………限于本文篇幅 余下代码请从51黑下载附件…………
下载：
四个led灯.zip
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